open-consul/vendor/github.com/envoyproxy/go-control-plane/pkg/conversion/struct.go

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// Copyright 2018 Envoyproxy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package conversion contains shared utility functions for converting xDS resources.
package conversion
import (
"bytes"
"errors"
"github.com/golang/protobuf/jsonpb"
"github.com/golang/protobuf/proto"
pstruct "github.com/golang/protobuf/ptypes/struct"
)
// MessageToStruct encodes a protobuf Message into a Struct. Hilariously, it
// uses JSON as the intermediary
// author:glen@turbinelabs.io
func MessageToStruct(msg proto.Message) (*pstruct.Struct, error) {
if msg == nil {
return nil, errors.New("nil message")
}
buf := &bytes.Buffer{}
if err := (&jsonpb.Marshaler{OrigName: true}).Marshal(buf, msg); err != nil {
return nil, err
}
pbs := &pstruct.Struct{}
if err := jsonpb.Unmarshal(buf, pbs); err != nil {
return nil, err
}
return pbs, nil
}
// StructToMessage decodes a protobuf Message from a Struct.
func StructToMessage(pbst *pstruct.Struct, out proto.Message) error {
if pbst == nil {
return errors.New("nil struct")
}
buf := &bytes.Buffer{}
if err := (&jsonpb.Marshaler{OrigName: true}).Marshal(buf, pbst); err != nil {
return err
}
return jsonpb.Unmarshal(buf, out)
}